'),
                      'parse_mode'                  => 'HTML',
                      'disable_web_page_preview'    => 'true'];

            $curl_options = [CURLOPT_URL            => $url,
                            CURLOPT_POST            => true,
                            CURLOPT_POSTFIELDS      => $params,
                            CURLOPT_CONNECTTIMEOUT  => 5,
                            CURLOPT_TIMEOUT         => 10,
                            CURLOPT_RETURNTRANSFER  => true,
                            CURLOPT_HEADER          => false];

            if(!empty($cfg['proxy_host'])) {
                $curl_options += [CURLOPT_PROXY         => "socks5://" . $cfg['proxy_host'] . ":" . $cfg['proxy_port'],
                                 CURLOPT_PROXYUSERNAME  => $cfg['proxy_user'],
                                 CURLOPT_PROXYPASSWORD  => $cfg['proxy_pass']];
            }

            $ch = curl_init();
            curl_setopt_array($ch, $curl_options);
            $result = curl_exec($ch);

            if($result)
            {
                $result = json_decode($result, true);

                if(isset($result['error_code']))
                {
                    if(is_object($alerts))
                    {
                        $alerts->add($this->title . ' ' . TEXT_ERROR . ' ' . $result['error_code'] . ' ' . $result['description'] . '. (chat_id: ' . $chat_id . ')', 'error');
                    }
                    else
                    {
                        error_log(date('Y-m-d H:i') . ' ' . $this->title . ' Error: ' . $result['error_code'] . ' ' . $result['description'] . '. (chat_id: ' . $chat_id . ')' . "\n",3,'log/sms.errors.log');
                    }
                }
                else
                {
                    $this->sendAttachments($cfg, $chat_id, $attachments);
                }
            }
        }
    }
    
    //to get available attachments form item
    function getAttachments($rule, $item)
    {
        global $app_fields_cache;
        
        $attachments = [];
        
        $description = $rule['description'];
        
        if(preg_match_all('/\[(\d+)\]/', $description, $matches))
        {
            foreach($matches[1] as $matches_key => $fields_id)
            {
                if(isset($app_fields_cache[$rule['entities_id']][$fields_id]))
                {
                    $type = $app_fields_cache[$rule['entities_id']][$fields_id]['type'];
                    
                    if(in_array($type, fields_types::get_attachments_types()))
                    {                                                
                        if(strlen($files = $item['field_' . $fields_id]??''))
                        {
                            foreach(array_map('trim', explode(',', $files)) as $filename)
                            {
                                $file = attachments::parse_filename($filename); 
                                if(is_file($file['file_path']))
                                {
                                    $attachments[$file['file_path']] = $file['name'];                                
                                }
                            }
                        }
                        
                    }
                }
            }
        }
        
        return $attachments;
    }
    
    //to send attachments in chat
    /*function sendAttachments($cfg, $chat_id, $attachmetns)
    {        
        if(count($attachmetns)>0)
        {
            $this->sendAttachmentsGroups($cfg, $chat_id, $attachmetns);
        }
        else
        {
            $url = "https://api.telegram.org/bot" . $cfg['bot_token'] . "/sendDocument";
                    
            foreach($attachmetns as $filepath => $filename)
            {
                $params = [
                    'chat_id' => $chat_id,
                    'document' => new CURLFile($filepath, mime_content_type($filepath), $filename),
                    'disable_notification' => 0,
                ];

                $ch = curl_init($url);
                curl_setopt($ch, CURLOPT_HEADER, false);
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
                curl_setopt($ch, CURLOPT_POST, 1);
                curl_setopt($ch, CURLOPT_POSTFIELDS, ($params));
                curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
                curl_setopt($ch, CURLOPT_TIMEOUT, 10);
                $result = curl_exec($ch);
                curl_close($ch);
            }
        }
    }
     * 
     */
    
    function sendAttachments($cfg, $chat_id, $attachmetns)
    {
        $groupKey = 0;
        $attachmentsGroups = [];
        $count = 1;
        foreach($attachmetns as $filepath => $filename)
        {
            $attachmentsGroups[$groupKey][$filepath] = $filename;
            
            if($count/9 == floor($count/9))
            {
                $groupKey++;
                $count=0;
            }
            
            $count++;                        
        }
        
        foreach($attachmentsGroups as $attachmentsGroup)
        {        
            $params = [
                'chat_id' => $chat_id,                
            ];
            
            $media = [];
            $key = 1;
            foreach($attachmentsGroup as $filepath => $filename)
            {
                $fileKey = 'file' . $key;
                $media[] = ['type' => 'document', 'media' => 'attach://' . $fileKey ];
                $params[$fileKey] = new CURLFile($filepath, mime_content_type($filepath), $filename);
                
                $key++;
            }
            
            $url = "https://api.telegram.org/bot" . $cfg['bot_token'] . "/sendMediaGroup";
                    
            $params['media'] = json_encode($media);
            

            $ch = curl_init($url);
            curl_setopt($ch, CURLOPT_HEADER, false);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, ($params));
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            //curl_setopt($ch, CURLOPT_TIMEOUT, 60);
            $result = curl_exec($ch);
        }
                
    }
    
    function removeAttachmentsFilenames($attachmetns, $text)
    {
        foreach($attachmetns as $filename)
        {
            $text = str_replace([$filename . ',', $filename], '', $text);
        }
        
        return $text;
    }
}